Qt——功能：序列帧动画

测试环境：win10、Qt Creator 4.11.1、5.14.2版本SDK

一、实际效果：

二、实现原理：

1.序列帧图是将一系列动作放在一张图中展示，一般每幅图大小相等（方便程序处理）。

2.根据每一帧大小定时绘制一幅图。

3.在paintEvent使用QPainter的drawPixmap进行绘制。

三、源代码

sequenceFrameAnimation.h#ifndef SEQUENCEFRAMEANIMATION_H
#define SEQUENCEFRAMEANIMATION_H#include <QWidget>
#include <QLabel>
#include <QTimer>
#include <QPixmap>class SequenceFrameAnimation : public QWidget
{Q_OBJECT
public:enum AnimationSequence{BeginToEnd,EndToBegin,};explicit SequenceFrameAnimation(QWidget *parent = nullptr);~SequenceFrameAnimation();bool setSequenceFrameAnimation(const QString& fileName, int frameWidth, int frameHeight, int frameRate);bool setAnimationSequence(AnimationSequence sequence);bool setStartFrameIndex(int index = 0);void setScaled(const QSize& size);    //设置缩放大小时，长宽必须是每一帧长宽的整数倍void setLoopEnabled(bool enabled);    //设置循环播放void setSpeedUpEnabled(bool enabled);    //动画启动加速过程bool start();    //开始void stop();    //结束signals:private slots:void onTimeout();void onSpeedUp();protected:void paintEvent(QPaintEvent *event) override;private:QPixmap m_sequenceFramePixmap;QSize m_scaledSize;QRect m_currentFrameRect;QTimer m_timer;QTimer m_speedUpTimer;const int m_maxSpeedUpCount;int m_currentSpeedUpCount;int m_perFrameWidth;int m_perFrameHeight;int m_frameRate;int m_frameIndex;int m_row;int m_col;AnimationSequence m_animationSequence;bool m_loop;bool m_needSpeedUp;private:int getCurrentSpeedUpTime();
};#endif // SEQUENCEFRAMEANIMATION_HsequenceFrameAnimation.cpp#include "sequenceframeanimation.h"
#include <QPainter>
#include <QStyleOption>
#include <QtMath>
#include <QDebug>#define SPEEDUP_INTERVAL 10SequenceFrameAnimation::SequenceFrameAnimation(QWidget *parent) : QWidget(parent),m_maxSpeedUpCount(10),m_currentSpeedUpCount(1),m_perFrameWidth(0),m_perFrameHeight(0),m_frameRate(0),m_frameIndex(0),m_animationSequence(BeginToEnd),m_loop(false),m_needSpeedUp(false)
{setWindowFlags(Qt::FramelessWindowHint | Qt::NoDropShadowWindowHint);setAttribute(Qt::WA_TranslucentBackground, true);connect(&m_timer, &QTimer::timeout, this, &SequenceFrameAnimation::onTimeout);connect(&m_speedUpTimer, &QTimer::timeout, this, &SequenceFrameAnimation::onSpeedUp);resize(100, 100);
}SequenceFrameAnimation::~SequenceFrameAnimation()
{}bool SequenceFrameAnimation::setSequenceFrameAnimation(const QString& fileName, int frameWidth, int frameHeight, int frameRate)
{bool ret = (fileName.isEmpty() ? false : true) && (frameWidth > 0) && (frameHeight > 0) && (frameRate > 0);if(ret){m_sequenceFramePixmap.load(fileName);m_col = m_sequenceFramePixmap.width() / frameWidth;m_row = m_sequenceFramePixmap.height() / frameHeight;m_perFrameWidth = frameWidth;m_perFrameHeight = frameHeight;m_frameRate = frameRate;m_currentFrameRect = QRect(0, 0, m_perFrameWidth, m_perFrameHeight);m_scaledSize = m_sequenceFramePixmap.size();resize(m_perFrameWidth, m_perFrameHeight);}return ret;
}bool SequenceFrameAnimation::setAnimationSequence(AnimationSequence sequence)
{bool ret = (BeginToEnd == sequence) || (EndToBegin == sequence);if(ret){m_animationSequence = sequence;}return ret;
}bool SequenceFrameAnimation::setStartFrameIndex(int index)
{bool ret = (0 <= index) && (index <= (m_row * m_col));if(ret){m_frameIndex = index;int x = 0;int y = 0;if(BeginToEnd == m_animationSequence){x = (m_frameIndex % m_col) * m_perFrameWidth;y = (m_frameIndex / m_col) * m_perFrameHeight;m_currentFrameRect = QRect(x, y, m_perFrameWidth, m_perFrameHeight);}else{x = m_sequenceFramePixmap.width() - (m_frameIndex % m_col + 1) * m_perFrameWidth;y = m_sequenceFramePixmap.height() - (m_frameIndex / m_col + 1) * m_perFrameHeight;m_currentFrameRect = QRect(x, y, m_perFrameWidth, m_perFrameHeight);}update();}return ret;
}void SequenceFrameAnimation::setScaled(const QSize& size)
{m_scaledSize = size;
}void SequenceFrameAnimation::setLoopEnabled(bool enabled)
{m_loop = enabled;
}void SequenceFrameAnimation::setSpeedUpEnabled(bool enabled)
{m_needSpeedUp = enabled;
}bool SequenceFrameAnimation::start()
{bool ret = m_sequenceFramePixmap.isNull() ? false : true;if(ret){m_sequenceFramePixmap = m_sequenceFramePixmap.scaled(m_scaledSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);m_perFrameWidth = m_sequenceFramePixmap.width() / m_col;m_perFrameHeight = m_sequenceFramePixmap.height() / m_row;int x = 0;int y = 0;if(BeginToEnd == m_animationSequence){x = (m_frameIndex % m_col) * m_perFrameWidth;y = (m_frameIndex / m_col) * m_perFrameHeight;m_currentFrameRect = QRect(x, y, m_perFrameWidth, m_perFrameHeight);}else{x = m_sequenceFramePixmap.width() - (m_frameIndex % m_col + 1) * m_perFrameWidth;y = m_sequenceFramePixmap.height() - (m_frameIndex / m_col + 1) * m_perFrameHeight;m_currentFrameRect = QRect(x, y, m_perFrameWidth, m_perFrameHeight);}resize(m_perFrameWidth, m_perFrameHeight);if(m_needSpeedUp){m_currentSpeedUpCount = m_maxSpeedUpCount - 1;int time = getCurrentSpeedUpTime();m_speedUpTimer.setInterval(time);m_speedUpTimer.start();}else{m_speedUpTimer.start(m_frameRate);}update();}return ret;
}void SequenceFrameAnimation::stop()
{m_timer.stop();
}void SequenceFrameAnimation::onTimeout()
{m_frameIndex++;if(m_frameIndex >= (m_row * m_col)){if(m_loop){m_frameIndex = 0;}else{m_timer.stop();m_frameIndex = 0;return;}}int x = 0;int y = 0;if(BeginToEnd == m_animationSequence){x = (m_frameIndex % m_col) * m_perFrameWidth;y = (m_frameIndex / m_col) * m_perFrameHeight;}else{x = m_sequenceFramePixmap.width() - (m_frameIndex % m_col + 1) * m_perFrameWidth;y = m_sequenceFramePixmap.height() - (m_frameIndex / m_col + 1) * m_perFrameHeight;}m_currentFrameRect = QRect(x, y, m_perFrameWidth, m_perFrameHeight);update();
}void SequenceFrameAnimation::onSpeedUp()
{m_currentSpeedUpCount--;m_frameIndex++;m_frameIndex = m_frameIndex % (m_row * m_col);if(m_currentSpeedUpCount <= 0){m_speedUpTimer.stop();m_timer.start(m_frameRate);m_currentSpeedUpCount = m_maxSpeedUpCount;}else{int x = 0;int y = 0;if(BeginToEnd == m_animationSequence){x = (m_frameIndex % m_col) * m_perFrameWidth;y = (m_frameIndex / m_col) * m_perFrameHeight;}else{x = m_sequenceFramePixmap.width() - (m_frameIndex % m_col + 1) * m_perFrameWidth;y = m_sequenceFramePixmap.height() - (m_frameIndex / m_col + 1) * m_perFrameHeight;}m_currentFrameRect = QRect(x, y, m_perFrameWidth, m_perFrameHeight);int time = getCurrentSpeedUpTime();m_speedUpTimer.setInterval(time);update();}
}void SequenceFrameAnimation::paintEvent(QPaintEvent *event)
{QPainter painter(this);painter.setRenderHint(QPainter::SmoothPixmapTransform, true);painter.drawPixmap(rect(), m_sequenceFramePixmap, m_currentFrameRect);
}int SequenceFrameAnimation::getCurrentSpeedUpTime()
{return (m_frameRate + m_currentSpeedUpCount * SPEEDUP_INTERVAL);
}

四、使用示例

#include <QApplication>
#include "groupsucceedwidget.h"int main(int argc, char *argv[])
{QApplication a(argc, argv);SequenceFrameAnimation w1;w1.setSequenceFrameAnimation(":/images/voiceSequence.png", 243, 36, 200);   w1.setAnimationSequence(SequenceFrameAnimation::BeginToEnd);    //播放顺序：头到尾w1.setLoopEnabled(true);    //循环播放w1.show();w1.start();  return a.exec();
}

序列帧图：

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